Application Of The High-density Resistivity Method In Goaf Exploration In Daqingtougou Village Of Helong City

Ground subsidence caused by coal mined-out area is one of the common geological disasters,which seriously threatens people's life and property safety and restricts social and economic development.The high-density electrical method has the characteristics of high observation accuracy,high construction efficiency and large amount of data collected,and is widely used in geological disaster management and engineering investigation of underground goaf,landslide,debris flow,etc.This article is based on collecting a large amount of exploration area,on the basis of geological data,according to the characteristics of the mined-out area prospecting area and its surrounding rock of the earth's physical characteristics,targeted to build the corresponding geoelectric model,and adopt the method of numerical simulation,the main research content is as follows: first of all,by building a simple single model,research the optimal gear form;Then,according to the multiple goafs and related geological structures in the exploration area,the corresponding complex geoelectric model is constructed to match it.Through the analysis and comparison of the simple single model and the complex model,the following conclusions are finally drawn :(1)the high-density electrical method can effectively distinguish the high-resistance and low-resistance abnormal bodies in the detection depth;(2)wenner device has better exploration effect for goaf in exploration area compared with other devices;(3)in the case of multiple goafs in the same section,it basically has no impact on inferring the location,burial depth and scale of the goaf in the coal field;The fault structure has no influence on the location,burial depth and size of the goaf in the coal field.The fault structure location in the inversion results is basically consistent with the model's fault location,with the tendency consistent with the model,and the occurrence is more precipitous than the model.In order to study the optimal device form of the high-density electrical method in the exploration area and the detection effect of the complex goaf,the single and complex goaf models were respectively constructed for comparative analysis and research.By comparing and analyzing the measured data with the numerical simulation results,and inferring the type,depth and center width of the abnormal body,the borehole verification results of the delimited low-resistivity anomalies dy-1 and dy-4 are consistent with the geophysical inference and interpretation results,indicating that the high-density electrical method in the exploration area has achieved good results.